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Suitability of Hermetia illucens larvae meal and fat in broiler diets:effects on animal performance,apparent ileal digestibility,gut histology,and microbial metabolites

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Journal of Animal Science and Biotechnology 2022年第5期13卷 1386-1401页

作者： Kristina Hartinger Katharina Froschl Marco Antonio Ebbing Barbara Bruschek-Pfleger Karl Schedle Christiane Schwarz martin gierus Department of Agrobiotechnology Institute of Animal NutritionLivestock Productsand Nutrition PhysiologyUniversity of Natural Resources and Life SciencesViennaAustria

Background:The possibility of partially replacing soybean meal(SBM)with Hermetia illucens(HI)defatted larvae meal in broiler nutrition has frequently been *** sustainability reasons,however,the larvae fat produced during defatting should also be used and could be particularly beneficial regarding gut health due to its fatty acid *** evaluate the suitability of HI larvae as protein and fat source,a 2×3 factorial arrangement with two types of protein,***(S)or SBM and 15%of its crude protein replaced by HI larvae meal(L),and three levels of fat sources,namely 0(0 L),50%(50 L)or 100%HI larvae fat(100 L)at the expense of soybean oil was ***:In the starter phase,an interaction showed higher body weight(BW),average daily gain(ADG)and improved feed conversion ratio(FCR)if 50%or 100%HI larvae fat was fed with HI larvae ***,BW,ADG and FCR improved when feeding HI larvae meal as protein ***,we observed an increased average daily feed intake in the grower,finisher,and overall phase in the L groups and an improved FCR in 0 L compared to 50 L groups during the overall *** apparent ileal digestibility,HI larvae meal feeding increased dry matter,organic matter,and fat *** HI larvae meal as protein source decreased the concentrations of agmatine,spermidine,spermine and ammonia in the caecal digesta,whereas fat source affected agmatine with higher concentrations in 50 L compared to 0 L in the colonic *** contrast,caecal ethanolamine concentrations increased in HI larvae meal groups compared to *** butyric acid concentrations decreased with HI larvae meal *** interaction was found for the jejunal villus area,being higher in L+100 L compared to S+100 ***,L groups had greater villus ***:A partial replacement of SBM with HI larvae meal and soybean oil with HI larvae fat in broiler diets without impairing animal performance or gut health seems possible

关键词： Broiler chicken Hermetia illucens Larvae fat Larvae meal Lauric acid Microbial metabolites Performance

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Grazing effects on herbage nutritive values depend on precipitation and growing season in Inner Mongolian grassland

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Journal of Plant Ecology 2016年第6期9卷 712-723页

作者： Haiyan Ren Guodong Han Zhichun Lan Hongwei Wan Philipp Schönbach martin gierus Friedhelm Taube Department of Grassland Science College of Ecology and Environmental ScienceInner Mongolia Agricultural UniversitySaihan DistrictZhaowuda Road 306Hohhot 010019China College of Agro-grassland Science College of Prataculture ScienceNanjing Agricultural UniversityXuanwu DistrictWeigang Road 1Nanjing 210000China Institute of Crop Science and Plant Breeding-Grass and Forage Science/Organic Agriculture Christian-Albrechts-UniversityHermann-Rodewald-Str.924118 KielGermany Center for Watershed Ecology Institute of Life Science and Ministry of Education Key Laboratory of Poyang Lake Environment and Resource UtilizationNanchang UniversityHonggutan New DistrictXuefu Road 999Nanchang 330031China

Aims Grasslands are widely used for production of livestock,which depend on the nutritive value of herbage ***,there are still large uncertainties as to how grazing,precipitation and growing season interactively affect herbage nutritive *** Here,based on a grazing experiment with seven grazing intensities in an Inner Mongolian grassland since the year 2005,we analysed nutritive value of four dominant grass species from June to September in both a relatively wetter year(2008)and a drier year(2010).Herbage with high nutritive value is characterized by high concentration of crude protein,high concentration of cellulase digestible organic matter and low concentration of neutral detergent *** Findings We found that(i)grazing significantly increased the nutritive value of Leymus chinensis,Agropyron michnoi and Cleistogenes squarrosa but had minor effects on the nutritive value of Stipa grandis.(ii)For all species,nutritive values were greater in the wetter year than in the drier year and were greatest in the early growing season(June)and lowest at the end of the growing season(September).Inter-annual and inter-seasonal variations in nutritive value were much greater for *** and *** than for *** and ***,suggesting higher water use efficiency for the latter two species.(iii)Grazing significantly decreased the drought resistance of three species,but not of ***.(iv)Grazing significantly increased inter-month variation in nutritive value for *** and *** but had relatively minor or no effects on that of *** and ***,grazing effects on species nutritive values showed strong inter-annual and seasonal patterns,and species-specific responses might be related to species traits(*** use efficiency,digestibility).Our results have important implications for ecosystem management of arid and semiarid grasslands under intense grazing and global climatic change.

关键词： grazing avoidance strategy drought resistance water limitation regrowth maturation

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